package com.itheima.security;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.pojo.User;
import com.itheima.service.UserService;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * @author ：yeshenyue
 * @date ：Created in 2019/12/10
 * @description ：
 * @version: 1.0
 */
@Component
public class SpringSecurityUserService implements UserDetailsService{
    @Reference //注意：此处要通过dubbo远程调用用户服务
    private UserService userService;


    //根据页面输入的用户名查询数据库中的用户信息
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        if(StringUtils.isEmpty(username)){
            return null;
        }
        User user = userService.findByUsername(username);
        if(user == null){
            //用户名不存在
            return null;
        }

        List<GrantedAuthority> list = new ArrayList<>();

        //为用户动态授权
        Set<Role> roles = user.getRoles();
        if(roles != null && roles.size() > 0){
            for (Role role : roles) {
                //为当前用户授予角色
                list.add(new SimpleGrantedAuthority(role.getKeyword()));
                //为用户权限授权
                Set<Permission> permissions = role.getPermissions();
                if(permissions != null && permissions.size() > 0){
                    for (Permission permission : permissions) {
                        //为当前用户授权
                        list.add(new SimpleGrantedAuthority(permission.getKeyword()));
                    }
                }
            }
        }

        return new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);
    }
}
